ALLEN PARK >> Now it gets serious. Friday’s training camp will be the first in full pads for the Detroit Lions.

Under NFL rules a team must wait for full three days to put the team in full pads.

“It’s going to be a situation where we’ll do maybe a little bit more heavy hitting, but you get most of your work in this league in terms of tackling and taking guys to the ground during preseason games,’’ coach Jim Caldwell said. “That’s kind of where you get the get majority of it. We’ll do some isolated things, but for the most part you want to see whether or not a guy can carry his pads, run in his pads, in the heat.’’

Thursday’s practice was the warmest day yet, although not enough for Caldwell.

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“We need some (heat). Particular, for some of the games we have in warm weather. We’ll be challenged. Hopefully we can get acclimated, but that’s what we’ll be looking for,’’ Caldwell said. “Can they carry their pads? Can they run behind them, use leverage, and bend their knees? When fatigue sets in, can they overcome it and can they strike consistently? We’re looking for those things.”

Friday’s practice starts at 3:30 p.m. and is open to the public.

Williams gaining

Michael Williams is in his second Lions’ training camp, but it’s his first an offensive lineman. He was drafted in 2013 as a tight end.

It’s a process and that includes bulking up.

Williams has gained about 15 pounds to get to 298. His goal is to get the 305-310 pound range.

“Just working out and trying not to overload too much on food, food does play a big part of it,’’ Williams said. “It’s more eating the right things, a lot of protein stuff just trying to put on the right weight.’’

The protein?

“Ii don’t know specifically,’’ Williams said. “I was in Alabama at the time where whatever you kill is what you eat.’’

It was a joke.

Williams sat out Thursday’s practice with an undetermined injury. Caldwell said it’s not major, he expects him to be out a few days.

DeVries visits

Jared DeVries traded in football to own a small chain of grocery stores in Iowa.

That explains why Lions president Tom Lewand snuck up behind him on Thursday asking, “Do you know where I can get a gallon of milk?’’

DeVries, who spent 10 seasons (1999-2008) as a defensive end for the Lions, was in town visiting.

He explained he kind of fell into the grocery business after a tornado leveled Clarksville, Iowa.

“We thought it was critical to put up a store for the rebirth of the community. It started there, that was our one and only,’’ DeVries said. Since then four more stores have been added.

The business world doesn’t get his juices flowing like the NFL, but it has its rewards.

“ I like working with people and I don’t get nervous like I did on Sundays,’’ DeVries said.

He still watches every Lions game.

DeVries, who is 6-foot-4, is amazed by the size of the Lions’ defensive line.

“Jiminy Christmas I need a step ladder,’’ DeVries said. “... They’re all like 6-5, 6-6, 6-7 across the board.’’

Redding in, Wilson out

Wide receiver Cody Wilson was released on Thursday to make room on the roster for the Lions to sign defensive end Kris Redding who was undrafted out of Wake Forest.

Wilson played at Central Michigan University and Rochester Adams High School.

He was signed by the Lions as an undrafted rookie free agent on May 3, 2013.